Hi, if you own any xbox 360 game that is backward compatible (full list here
www.xbox.com/.../backward-compatibility), then you just log into xbox live on the xbox one with the same account you use on the xbox 360, and your games if bought digitally will show in your ready to install section, ready for you to install. If you have
a game on disk, then just insert the disk and install the game. If you have games that are not backwards compatible, then they might become compatible in the future, as they are adding new back compat games each month. Some Xbox 360 games will never be compatible,
those games may have an xbox one version, which if you want to play them, then you will have to purchase them again.
I hope I have answered some or all the question, happy gaming!
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